rust/src/librustc/middle/trans/uniq.rs
Patrick Walton 53f41f07ce librustc: Make vectors no longer implicitly copyable in rustc. r=graydon
~20% perf win for trans on -O0, with other minor improvements across the board.
No effect on -O2.
2013-01-07 14:17:36 -08:00

61 lines
2.0 KiB
Rust

// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use back;
use lib::llvm::ValueRef;
use middle::trans::base::*;
use middle::trans::build::*;
use middle::trans::common::*;
use middle::trans::datum::immediate_rvalue;
use middle::trans::datum;
use middle::trans::glue;
use syntax::ast;
export make_free_glue, autoderef, duplicate;
fn make_free_glue(bcx: block, vptrptr: ValueRef, box_ty: ty::t)
-> block {
let _icx = bcx.insn_ctxt("uniq::make_free_glue");
let box_datum = immediate_rvalue(Load(bcx, vptrptr), box_ty);
let not_null = IsNotNull(bcx, box_datum.val);
do with_cond(bcx, not_null) |bcx| {
let body_datum = box_datum.box_body(bcx);
let bcx = glue::drop_ty(bcx, body_datum.to_ref_llval(bcx),
body_datum.ty);
glue::trans_unique_free(bcx, box_datum.val)
}
}
fn duplicate(bcx: block, src_box: ValueRef, src_ty: ty::t) -> Result {
let _icx = bcx.insn_ctxt("uniq::duplicate");
// Load the body of the source (*src)
let src_datum = immediate_rvalue(src_box, src_ty);
let body_datum = src_datum.box_body(bcx);
// Malloc space in exchange heap and copy src into it
let {bcx: bcx, box: dst_box, body: dst_body} =
malloc_unique(bcx, body_datum.ty);
body_datum.copy_to(bcx, datum::INIT, dst_body);
// Copy the type descriptor
let src_tydesc_ptr = GEPi(bcx, src_box,
[0u, back::abi::box_field_tydesc]);
let dst_tydesc_ptr = GEPi(bcx, dst_box,
[0u, back::abi::box_field_tydesc]);
let td = Load(bcx, src_tydesc_ptr);
Store(bcx, td, dst_tydesc_ptr);
return rslt(bcx, dst_box);
}